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DNA Structure and Replication

DNA Structure and Replication
DNA with a G-C content of 50% will melt at approximately

90 °C
100 °C
70 °C
60°C

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DNA Structure and Replication
DNA helicase is used to

break a phosphodiester bond in DNA strand
None of these
unwind the double helix
interact the double helix closely

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DNA Structure and Replication
DNA gyrase in E. coli

adds positive supercoils to chromosomal DNA
can be inhibited with antibiotics
is required only at the oriC site
performs the same function as helicase in eukaryotes

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DNA Structure and Replication
DNA replication takes place in which direction?

3' to 5'
5 'to 3'
Randomly
Vary from organism to organism

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DNA Structure and Replication
The overall conclusion of the Hershey-Chase experiment was that

proteins and DNA were responsible for heredity
phage DNA was similar to bacterial DNA
DNA was responsible for heredity
the ratio of Adenine to thymine was always the same

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DNA Structure and Replication
Number of times the two DNA strands are interwined in circular DNA and is known as

linking number
helix frequency
none of these
twisting number

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